#include <iostream>
using namespace std;
int main()
{
int a,b;
a=100;
b=200;
a=b-a;  
b-=a;  //b-=a=b=b-a
a+=b;  //a+=b=a=a+b
cout <<"a="<<a<< "b="<<b<<endl;
return 0;
}
